These are 9x16 Charlieplexed LEDs designed to match with theAdafruit 16x9 Charlieplexed PWM LED Matrix Driver -IS31FL3731. You don39t get any resistors or driver chips with this grid, its just a mess of LEDs in a charlieplexed arrangement This is the Blue version. Check out our other colors! Check out our detailed tutorial for pinouts, assembly, wiring, and more!